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Atari 400 Service Manual

Atari 400
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CHAPTER 3 - SYSTEM OPERATION
3.1 INTRODUCTION
This chapter will cover the procedures required for system power-up,
using the keyboard and screen editor functions, using Program Car-
tridge system keys, operating the hand controllers, and operating the
ATARI 410 Program Cassette Recorder.
3.2 SYSTEM POWER-UP
Two modes of system power-up exist for the ATARI 400/800 Personal
Computer Systems; power-up with disk drives and power-up without disk
drives. Before continuing with system power-up ensure that you have
unpacked and set-up your system according to the instructions
outlined in Chapter 2, System Installation.
3.2.1 System Power-Up Without Disk Drive
The following steps detail the procedures required to power-up an
ATARI 400 or 800 Personal Computer System without an attached Floppy
Disk Drive. These procedures assume that the system has been set-up
according to the instructions contained in Chapter 2, System
Installation.
Without Program Cartridge.
To power-up the system without a Program Cartridge requires only that
the system be connected to all devices correctly, and the System
Power-ON switch is set to ON. After a few seconds, the screen will
display the "ATARI COMPUTER - MEMO PAD" logo. The Memo Pad Logo
indicates that the system has run a self-test, with no failures, and
is ready to accept information from the Keyboard.
With Proqram Cartridge.
To power-up the system with the Program Cartridge installed, requires
only that the system be connected to all devices correctly, and the
System Power-ON switch is set to ON. After a few seconds, the screen
will display a prompt depending upon the Program Cartridge, ie., the
BASIC Cartridge prompts you with a "READY" written on the screen.
Some Program Cartridges might require you to press the START key or
load a program from the Program Cassette Recorder. The screen display
will prompt you with the correct action for you to take.
ATARI Personal Computers 3-1

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Atari 400 Specifications

General IconGeneral
ManufacturerAtari
Model400
TypeHome Computer
Release Year1979
CPUMOS Technology 6502
CPU Speed1.79 MHz
ROM10 KB
Operating SystemAtari OS
KeyboardMembrane keyboard
RAM8 KB (expandable to 48 KB)
GraphicsANTIC and GTIA chips
Sound4 channels
DisplayRF output for connection to TV
StorageOptional cassette tape drive or floppy disk drive
PortsCartridge
Display Resolution320x192 (16 colors)

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